Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29effae77401f99…

MALICIOUS

PDF

98.0 KB Created: 2021-09-02 15:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd314eb271b14734355ca54af3a13cef SHA-1: 5066516f4d9bda2a45824b945f85dbb96f4cf09d SHA-256: e29effae77401f99ad84f63b078c1c0804383c6ac33a2e93ca7beccd3c718026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and potentially malicious files, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the PDF structure support the classification as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://magyar-logyogyasz.hu/fileok/file/18540661149.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4526b072a1997693145acc00dbe82426/85801834875.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/47786504017.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/64098741507.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7ce525b3---lumukorum.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/kp3dnvfbnaokovgrasfmc5fl5g/bogutexevun.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624357615.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/328342af856bf804c1fabef958933158/3493927180.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/vunugubanibifubu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xugigarinegozigigi.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1366541897611cf96be77f5.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/31783958711.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/medip.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/88904509533.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acb3e996c6---fasotoladowexofiluzugimub.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf88f71173---28191808838.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/fomiji.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/38849392236.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/55195245963.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/zafaduxupivodirakupoja.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/11707945613.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57a927372---69530856775.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/bipazizifetujawemug.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/buwod.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651eb70130---buremobiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608525bb02ea7---xemelomovabidederifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=romanesque+art+and+architecture+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 11128 bytes
SHA-256: 8c7b175df65215742bfcbd9dee67d056ebf37c19dbe1bd595c29ac78bf80a9ac
font_02_sfnt_off00014f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1B 16812 bytes
SHA-256: 1ea29efed882e7ab0310f942579e0b65c9bf0c0c8247a54d03309ddb56a4bee3

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